Extension Metadata

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About this extension

Note for Firefox 57 users:

Update to the note below - there's a bug (https://bugzilla.mozilla.org/show_bug.cgi?id=1373640) open to add DNS resolution to the Webextensions API. Assuming this gets implemented in a way that's compatible with how SixOrNot works I will have a go at making an updated version of the addon :)

Sadly, due to Mozilla's questionable decision to deprecate their old addon APIs in favour of becoming a Chrome-clone browser SixOrNot will not work with versions of Firefox after 56. The new Webextensions API doesn't provide the functionality required for SixOrNot to work (and despite my best efforts, Mozilla have no interest in adding it). Thank you all for your support over the years in using this addon.

See at a glance whether websites support IPv6, with additional information about each domain contacted to display the current page. Now also shows local IP addresses, proxy use and TLS/security status for connections.

Information comes from both the DNS entries of the servers contacted to load page elements and from the connections Firefox makes to those servers - providing the most complete information possible.

The icon can be shown either in the address bar or as a toolbar button (which can be customized to many locations in the Firefox interface).

This addon does not consult with any external service to determine your own IP address, avoiding any privacy concerns arising from such behaviour. Sixornot makes use of your OS's native DNS resolution capability which permits a more accurate assessment of your IPv4/IPv6 connectivity.

By looking at both the DNS entries for a domain and the IP version used to make connections to it Sixornot can see when you are connecting via IPv4, but the remote site has the capability to be contacted via IPv6 - useful for those interested in whether sites are IPv6-capable but are not on an IPv6 connection themselves.

DNS and IP address information can be copied to the clipboard by clicking on entries.

Version 2 adds information about security (TLS status) for all the servers contacted in loading a page, along with more detailed information about whether connections used a proxy